EP1205278A1 - Kühlvorrichtung für eine Werkzeugmaschine - Google Patents

Kühlvorrichtung für eine Werkzeugmaschine Download PDF

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Publication number
EP1205278A1
EP1205278A1 EP01127028A EP01127028A EP1205278A1 EP 1205278 A1 EP1205278 A1 EP 1205278A1 EP 01127028 A EP01127028 A EP 01127028A EP 01127028 A EP01127028 A EP 01127028A EP 1205278 A1 EP1205278 A1 EP 1205278A1
Authority
EP
European Patent Office
Prior art keywords
housing
cooling
machine tool
cooling liquid
supply unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01127028A
Other languages
English (en)
French (fr)
Inventor
Mitsugu Hara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ecoreg Ltd
Original Assignee
Ecoreg Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ecoreg Ltd filed Critical Ecoreg Ltd
Publication of EP1205278A1 publication Critical patent/EP1205278A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/12—Arrangements for cooling or lubricating parts of the machine
    • B23Q11/126—Arrangements for cooling or lubricating parts of the machine for cooling only
    • B23Q11/127—Arrangements for cooling or lubricating parts of the machine for cooling only for cooling motors or spindles

Definitions

  • the present invention relates to a cooler for a machine tool
  • a main spindle is rotatably supported by a housing via a bearing, so that heat generated by the rotation of the main spindle is conducted to the housing, Therefore, a cooler for cooling the housing is provided in such a machine tool.
  • a cooler for cooling the housing is the structure for cooling a spindle unit as shown in Fig. 4 which is disclosed in Japanese unexamined Patent Publication No. 6-31585 (1994).
  • the spindle unit includes a housing 31, a spindle cylinder 32 fixed within the housing 31, and a main spindle 33 rotatably supported in the housing 31 via a bearing unit 34 and an upper bearing (not shown).
  • the cooling structure of the spindle unit includes a cooling liquid channel defined between a helical groove 35 formed in an outer peripheral surface of the main spindle 33 and a bearing inner cylinder 36 of the bearing unit 34, and another cooling liquid channel defined between a helical groove 37 formed in an outer peripheral surface of the spindle cylinder 32 and the housing 31.
  • the spindle unit further includes a cooling liquid supply path 38, a cooling liquid drain path 39, a cooling liquid inlet port 40 and a cooling liquid outlet port 41.
  • a cooling liquid is supplied to the respective cooling liquid channels by a cooling liquid supply unit which has an orifice for flow rate control, a sensor for temperature control and the like.
  • a cooling liquid supply unit specifically designed for supplying the cooling liquid to the cooling liquid channels in the spindle unit cooling structure is quite expensive, thereby making the machine tool itself more expensive.
  • a cooler for a machine tool which comprises a main spindle, a housing rotatably supporting the main spindle via a bearing, and a channel provided in association with the housing for passing a cooling mist therethrough.
  • the channel for passing the cooling mist therethrough is in association with the housing. Therefore, the housing can be cooled by passing the cooling mist through the channel in association with the housing and taking heat away from the housing by evaporation of the cooling mist.
  • the cooling mist can easily be generated with the use of a cooling liquid supply unit and a compressed air supply unit, both typically included in the machine tool.
  • a tank containing a cooling liquid, a lubricating liquid or a mixture of the cooling liquid and the lubricating liquid for cooling or lubricating a tool, and a pump for supplying the cooling liquid or the like from the tank to a cooling liquid injection nozzle typically are provided in the machine tool as the cooling liquid supply unit.
  • an air compressor for supplying compressed air to eject the cooling liquid or the like from the cooling liquid injection nozzle typically is provided in the machine tool as the compressed air supply unit. Therefore, the generation of the cooling mist can easily be achieved by mixing the cooling liquid supplied from the cooling liquid supply unit with the compressed air supplied from the compressed air supply unit so as to produce the cooling liquid in mist form.
  • the channel comprises a tube helically wound around the housing in the inventive machine tool cooler
  • the channel can be formed from a less expensive tubular material.
  • the housing can be cooled from its interior with a more advantageous cooling effect.
  • Fig. 1 is a sectional view illustrating a cooler for a machine tool in accordance with one embodiment of the present invention.
  • the machine tool is a numerically controlled (NC) lathe.
  • a generally cylindrical housing 1 fixed to a headstock (not shown) has a center through-hole 1a, and a pair of bearings 2 are fixed to longitudinally opposite portions of the inner periphery of the center through-hole la.
  • a generally cylindrical main spindle 3 within through-hole 1a is rotatably supported by the bearings 2.
  • a chuck (not shown) is provided at one end (a right end in Fig. 1) of the main spindle 3.
  • a pulley 4 is fixed around the other end portion (a left end portion in Fig.
  • the machine tool includes a cooling liquid supply unit (not shown) including a tank containing a cooling water (cooling liquid) such as tap water and a pump for supplying the cooling water from the tank to a cooling water injection nozzle (not shown).
  • the machine tool further includes a compressed air supply unit (not shown) including an air compressor for supplying compressed air to the cooling water injection nozzle.
  • the cooling water and the compressed air are supplied from the cooling liquid supply unit and the compressed air supply unit, respectively, to the cooling water injection nozzle, so that the cooling water from the cooling water injection nozzle is sprayed over a machining part (including a machining surface of the tool and a machined surface of a workpiece).
  • the housing 10 has a helical groove 10 formed in an outer peripheral surface thereof, and a tube 11 such as a flexible tube is helically wound around the housing 1 along the groove 10.
  • a tube 11 such as a flexible tube is helically wound around the housing 1 along the groove 10.
  • One end of the tube 11 is connected to a bifurcated connection tube 12 (one example of mist generating means), and the other end of the tube is open to the atmosphere.
  • the bifurcated connection tube 12 has a confluent portion 13 connected to the one end of the tube 11, and two branch portions 14, 15 branched from the confluent portion 13.
  • the branch portions 14 is connected to the cooling liquid supply unit via a hose or the like, and the branch portion 15 is connected to the compressed air supply unit via a hose or the like.
  • cooling water is supplied from the cooling liquid supply unit to the cooling water injection nozzle and to the branch portion 14 of the bifurcated connection tube 12, and compressed air is supplied from the compressed air supply unit to the cooling water injection nozzle and to the branch portion 15 of the bifurcated connection tube. Then, the cooling water is sprayed over the machining part from the cooling water injection nozzle.
  • the cooling water and the compressed air respectively supplied to the branch portions 14 and 15 merge and mix with each other in the confluent portion 13, so that the cooling water is disintegrated into minute water particles in a mist form.
  • the resultant cooling mist flows into the tube 11 helically wound around the housing 1.
  • the water particles of the mist evaporate while passing through the tube 11 to cool the housing 1, and discharge from the other end of the tube 11 into the atmosphere.
  • the housing 1 is cooled by passing the cooling mist through the tube 11 helically wound around the housing 1 and withdrawing heat from the housing by the evaporation of the cooling mist.
  • the cooling mist may be generated by employing the cooling liquid supply unit and the compressed air supply unit already provided in the machine tool.
  • the tube 11 is required, the cooler is inexpensive since there is no need to provide a cooling mist supply unit specifically designed for the cooling of the housing.
  • tap water can be used as the cooling water and, hence, even if the cooling mist passed through the tube 11 is discharged from the other end of the tube 11 into the atmosphere, there is no adverse influence on the environment.
  • the tube 11 has a simple construction with the other end thereof being open to the atmosphere.
  • Fig. 2 is a sectional view illustrating a machine tool cooler according to another embodiment of the present invention.
  • This embodiment differs from the embodiment shown in Fig. 1 in that the tube 11 is not wound around the housing 1 along the groove 10 formed in the outer peripheral surface of the housing 10, but rather a cylindrical body 20 is fitted around the housing 1 in a liquid tight manner so as to close the circumferential open side of the groove 10.
  • a helical channel 21 is defined between the groove 10 and an inner peripheral surface of the cylindrical body 20.
  • One end of the channel 21 is connected to a bifurcated connection tube (mist generating means) 12 via a hose 22, and the other end of the channel is open to the atmosphere.
  • other components are the same as in the embodiment of Fig. 1, and like components are denoted by like reference characters.
  • This embodiment has similar functions and effects as the embodiment of Fig. 1.
  • Fig. 3 is a sectional view illustrating a machine tool cooler according to a further embodiment of the present invention.
  • This embodiment diffes from the embodiment shown in Fig. 1 in that a plurality of channels 25 (only one channel 25 is shown in Fig. 3) are within the housing 1.
  • One end of each of the channels 25 is connected to a bifurcated connection tube (mist generating means) 12 and the other end of each of the channels 25 is open to the atmosphere. Therefore, the tube 11 is not wound around the housing 1 along the groove 10.
  • other components are the same as in the embodiment of Fig. 1, and like components are denoted by like reference characters.
  • This embodiment has similar functions and effects as the embodiment of Fig. 1. However, the housing 1 can be cooled from its interior with a more advantageous cooling effect.
  • the groove 10 is formed in the outer peripheral surface of the housing 1, but the formation of the groove 10 is not necessarily required. Further, any of various cooling liquids and lubricating liquids may be used alone or as a mixture instead of the cooling water in the aforesaid embodiments. In the embodiment shown in Fig. 3, the channels 25 may be helically formed in the housing 1.
  • a motor incorporating the main spindle 3 may be employed to drive the main spindle.
  • the inventive machine tool cooler is applicable not only to a numerically controlled (NC) lathe, but also to any of various other machine tools such as machining centers and grinding machines.
  • NC numerically controlled
  • the housing can be cooled by passing the cooling mist through the channel provided in association with the housing which removes heat from the housing by the evaporation of the cooling mist.
  • the cooling mist can easily be generated with the use of a cooling liquid supply unit and a compressed air supply unit typically provided in the machine tool.
  • a tank containing a cooling liquid, a lubricating liquid or a mixture of the cooling liquid and the lubricating liquid for cooling or lubricating the tool and/or workpiece, and the pump for supplying the cooling liquid or the like from the tank to the cooling liquid injection nozzle typically are provided in the machine tool as the cooling liquid supply unit, and further an air compressor for supplying compressed air to eject the cooling liquid or the like from the cooling liquid injection nozzle typically is provided in the machine tool as the compressed air supply unit. Therefore, the generation of the cooling mist easily can be achieved by mixing the cooling liquid supplied from the cooling liquid supply unit with the compressed air supplied from the compressed air supply unit to produce the cooling liquid into a mist form.
  • the channel comprises a tube helically wound around the housing in the inventive machine tool cooler
  • the channel can be formed from an inexpensive tubular material.
  • the housing can be cooled from its interior with a more advantageous cooling effect.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
EP01127028A 2000-11-14 2001-11-14 Kühlvorrichtung für eine Werkzeugmaschine Withdrawn EP1205278A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000346821A JP2002144190A (ja) 2000-11-14 2000-11-14 工作機械の冷却装置
JP2000346821 2000-11-14

Publications (1)

Publication Number Publication Date
EP1205278A1 true EP1205278A1 (de) 2002-05-15

Family

ID=18820637

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01127028A Withdrawn EP1205278A1 (de) 2000-11-14 2001-11-14 Kühlvorrichtung für eine Werkzeugmaschine

Country Status (3)

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US (1) US20020056279A1 (de)
EP (1) EP1205278A1 (de)
JP (1) JP2002144190A (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6837065B2 (en) * 2003-04-25 2005-01-04 Stephen Permetti Mist cooler
JP5959811B2 (ja) * 2011-07-14 2016-08-02 電源開発株式会社 バーナ
KR101517905B1 (ko) * 2013-12-13 2015-05-06 한국전기연구원 냉각기구를 가지는 복합소호방식 가스 차단기
US20150285264A1 (en) * 2014-04-07 2015-10-08 Union Pacific Railroad Company Air compressor with self contained cooling system
JP2016083770A (ja) * 2016-02-01 2016-05-19 住友化学株式会社 切削加工方法及び切削加工装置、光学部材の製造方法
CN109416443B (zh) * 2016-05-13 2020-06-19 恩耐公司 用于高功率光纤连接器的双螺旋冷却剂通道
CN111843045A (zh) * 2020-06-05 2020-10-30 泉州市海恩德机电科技发展有限公司 一种冷却液分流散热的切割机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03196941A (ja) * 1989-12-26 1991-08-28 Nippondenso Co Ltd 主軸構造を備えた工作機械
US5150994A (en) * 1991-09-23 1992-09-29 Kaven Hsu Spindle means of machine center
JPH05285781A (ja) * 1992-04-10 1993-11-02 Sony Corp エアスピンドルユニット

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03196941A (ja) * 1989-12-26 1991-08-28 Nippondenso Co Ltd 主軸構造を備えた工作機械
US5150994A (en) * 1991-09-23 1992-09-29 Kaven Hsu Spindle means of machine center
JPH05285781A (ja) * 1992-04-10 1993-11-02 Sony Corp エアスピンドルユニット

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 015, no. 458 (M - 1182) 21 November 1991 (1991-11-21) *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 062 (M - 1553) 2 February 1994 (1994-02-02) *

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Publication number Publication date
US20020056279A1 (en) 2002-05-16
JP2002144190A (ja) 2002-05-21

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